Method and apparatus for determining the cerebral state of a patient with fast response

a technology fast response, which is applied in the field of method and apparatus for can solve the problems of excessive deep anesthesia, unfavorable patient recovery, and inability to accurately determine etc., and achieve the effect of accurately determining the cerebral state of a patien
US7228169B2Inactive Publication Date: 2007-06-05GE HEALTHCARE FINLAND
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
GE HEALTHCARE FINLAND
Publication Date
2007-06-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method and apparatus for ascertaining the cerebral state of a patient. The method/apparatus may find use in ascertaining the depth of anesthesia of the patient. In one embodiment, the entropy of the patient's EEG signal data is determined as an indication of the cerebral state. A frequency domain power spectrum quantity is obtained from the patient's EMG signal data. The latter quantity can be updated more frequently than the EEG entropy due to its higher frequency. The EEG entropy indication and the EMG power spectrum indication can be combined into a composite indicator that provides an immediate indication of changes in the cerebral state of the patient. In another embodiment, the frequency range over which the entropy of the biopotential signal from the patient is determined is broadened to encompass both EEG signal data and EMG signal data and the entropy so determined used as an indication of the patient's cerebral state.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present application is a divisional application of U.S. patent application Ser. No. 09 / 688,891, filed Oct. 16, 2000, and now U.S. Pat. No. 6,731,975.BACKGROUND OF THE INVENTION

[0002] The present invention relates to a method and apparatus for determining the cerebral state of a patient. One application of the method and apparatus is determining the extent of a hypnotic state of the patient resulting, for example, from the administration of an anesthetic agent. That extent is often termed the “depth of anesthesia.” In the method and apparatus of the present invention, changes in the cerebral state can be accurately and quickly determined.

[0003] In a simplistic definition, anesthesia is an artificially induced state of partial or total loss of sensation or pain, i.e. analgesia. For most medical procedures the loss of sensation is accompanied by a loss of consciousness on the part of a patient so that the patient is amnestic and is not awa...

Claims

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